Hydraulic bumper jack



Oct. 5, 1948. H. E.' PAGE HYDRAULIC BUMPER JACK 3 Sheets-Sheet 1 Filed Dec. 5, 1944 {Nl/ENTOR. E. P cz c/ 5' Oct. 5, 1948. H. E. PAGE j 2,450,603

HYDRAULIC BUMPER JACK j Filed Dec. 5, 1944 3 Sheets-Sheet 2 INVENTOR. JH Eri? E1-'t E. cz C/ E' Oct. 5, 1948. H. E, PAGE HYDRAULIC BUMPER JACK 5 Sheets-Sheet 3 Filed Dee. 5, 1944 JNVENTOR. Heli/:Euriw PLLC/er Patented Oct. 5, 1948 UNITED STATES iDATENT OFFICE HYDRAULIC BUMPER JACK Herbert E. Page, Alhambra, Calif. Application December 5, 1944, Serial No. 566,664

4 Claims.

My invention relates to hydraulic jacks of the type particularly adapted to be attached tothe bumper of a vehicle for lifting purposes, it being an object to `provide a jack of this sort character- .ized by its simplicity and economy of construc- K Another novelchar-ac'teristic of my inventionY resides in the provision of a simple, economical and eloient reservoir construction.`

lFor explanatory purposes, I show in the accompanying drawing and will now describe one 'specilc embodiment of the invention, from which .it will be obvious that the invention possesses still further novel obj-ect and features of advantage and that, within the scope of the appended claims, it may be embodied in other physical forms.

In the drawings,

Fig. 1 is a medial vertical section;

Fig. 2 is a section on line 2-2 of Fig. 1;

Fig. 3 is a section on line 3 3 of Fig. 1;

kFig. 4 is a section on line 4-4 of Fig. 3; and

Fig, 5 is an end view taken on line 5-5 of Fig. 1.

The numeral 5 designates the base to which the body 6 of the jack is secured by means of a depending lug 1 passing through an opening 8 in the base and being secured against escape by a cross pin 9. The bottom end of the body Ii is of semispherical shape and the lug 1 is of round cross section so that the body may rotate relative to the base. A washer I4 is interposed between the bottom of the base and pin 9 around the lug 1.

The body presents an outwardly opening socket I within which the bottom end of a perpendicular inner cylinder II is threaded, and axially of the socket there is a recess I2 within which the lower end of a fluid passing tube I is secured. The top end of the cylinder I I is closed by a cap I1 carrying in an annular recess a sealing ring I8, the tube I5 extending upwardly through the cap I1. The cap I1 4also serves as a spacer for the cylinder II and tube I5.

Telescopically mounted on the cylinder |I I provide an outer cylinder or sleeve 26 having a closed top end 2l and carrying an inner ring 22 adjacent its bottom end, which latter ring has annular seal rings 23, 24 for sealing engagement with the cylinder l I and the outer cylinde-r 20, respectively. The ring 22 is mounted in an enlarged diameter portion of the cylinder 20 and is held therein against outward escape by a retaining member 25. Y

The interior of the cylinders II'and 20 below the cap I 1 provides fluid reservoirs R and R adapted to contain hydrauli-c fluid, the reservoirs being lin communication with each other through openings 21 in cylinder Il. An 'annular stop ring 28 is secured on cylinder I I t-o be engaged by ring 22 .to limit extensive movement of the device, that is, to limit movement .of the outer cylinder20 axially upwardly on 'the inner cylinder I I-.

For attaching fthe jack to the bumper of avehicle I mount on the cylinder 26 a pair of collars 3Q, 3l which are adjustable axially of the cylinder 23 as well as relative to each other, each of the collars having v-shaped opposed arms 33 forengagement with the opposite edges of a bumper B.

The collar 30 is transversely split and presents at each side of :the split a flange 35, which anges are clamped together by the screw 35 to secure the `collar 30 in yadjusted position on the cylinder 20.

The collar 3| .is slid-ably adjustably mounted on the cylinder 20 and may be clamped towards the collar 3D, to connne the bumper therebetween,

'" by means of the screw 38, the lower end of which threadedly engages the collar 3|).y

Referring more particularly to Figs. 3\and 4 the body provides va pumping cylinder 40, lluid passageways 42, 43, 44, 45,` 46, and valve bores 41, 48, the latter bor-e being closed at its top end by a plug 49. In bore 48 ball check valves 50, 5I seat towards the reservoir and a needle valve `52 is threa-dedly mounted in bore 41 for controlling the passageway 42.

The body has bifurcations directly over the outer end of the cylinder 40, between which the inner end of a pumping lever 62 is pivotally mounted by a cross pin 63. The lever has a depending arm 65 which is pivotally connected by pin 66 with the outer end of connecting rod 61, the inner end of the connecting rod being spherical and eng-aging in a complementary recess -68 in the outer end of a pumping' piston 69, the piston 'being mounted to reciprocate in the cylinder 40. A coil .spring 16 bears at one end -against the inner end of cylinder 40 and bears at its other end against `the inner end portion of piston 69, ntting in a recess 1I in the inner end of the piston to urge the piston outwardly of the cylinder.

In operation the jack is placed in upright position besides the bumper of a vehicle and the collars 30, 3| tween the arms 33. Operation of the lever 62 reciprocates piston 69. Upon each outward or suction stroke of the piston fluid is drawn from adjusted to secure the bumper be-`l the reservoir through passageway 43, past check valve 5I and through passageway 44 and upon each inward or pressure stroke of the piston the fluid thus drawn into the cylinder 40 is forced past check valve 50, through passageway 42 and tube l5 into the pressure chamber 15 defined by the top end of the cylinder 20 and the cap Il. The pressure in chamber 15 thus moves the outer cylinder 20 and the carried collars upwardly to lift the vehicle, and inasmuch as the bumperis clamped' between the arms 33 the jack will not tilt sidewise despite the fact that the base is of relatively small diameter.

To lower the jack the needle valve 52 is screwed outwardly to open the passageways 45, 46 to passageway 42, thus allowing fluid to pass. back through tube 5 into the reservoir.

I claim:

. ,pairfof collars slidably carried by the cylinder 1. In a hydraulic bumper jack, a body carrying an upright cylinder, a piston secured to the top end portion of said cylinder, an outer cyl-- inder slidably mounted on the first-named cylinder for axial movement relative thereto and forming Vwith the rst-named cylinder a fluid reservoir, the outer cylinder having an end wall defining with the piston a pressure chamber, pressure-generating means in the body,A Valvecontrolled means providing communication between the reservoir and pressure-generating means, Hsecond valve-controlled means providing communication between the pressure-generating'means and the pressure chamber, third valve-controlled means for releasing fluid from the `pressure chamber to the reservoir, and bumper-engaging means slidably adjustably mounted on the outer cylinder.

2. lThe device of claim 1 wherein the bumperengaging means comprises a pair of collars relatively adiustably movable axially of the outer cylinder, and a bumper-engaging arm carried by each collar whereby to clamp a bumper therebetween.

3. The device of claim 1 wherein the bumperengaging means comprises a transversely split collar on the outer cylinder, screw means for clamping said collar about said cylinder, a second collar carried by the outer cylinder, said ,collars being relatively adjustably movable axially of the outer cylinder, and screw means cooperating with the collars to urge them towards each other whereby to clamp a bumper therebetween, eaeh of the collars .presenting a bumperengaging arm. Y v

4. In a bumper jack, a base, a cylinder carried vbythe base for movement perpendicular thereto, means for moving the cylinder relative to the base, and bumper clamping means comprising a for relative kmovement axially of the cylinder, a laterally projecting` bumper-engaging arm carriediby4 each collar, screw means for securing one of the collars in adjusted position on the cylinder andscrew-means carried by one of the collars and threadedly engaging the other whereby to draw the collars towards each other and thereby clamp a bumper therebetween.

V HERBERT E. PAGE.

REFERENCES CITED The following references are of record in the le of this patent:

'791,725 France Dec. 16, 1935 

